Never saw this one and it's really fun for a FPS. It's very basic, shooting bad guys in the city, hotels, etc. in the 1930's. Basic controls, lousy sound (static but the essential sounds to play come through) and surprisingly tough as you get further into the levels.
Controls: (Wish more people would give this info!)
Fire == Control Key
Shield from bullets == ALT Key
Direction == Arrow Keys
Pause == "P" Button (doesn't always stop game!)
You'll figure out more on your own, including the eccentricities of the "shield" mode. Hope you enjoy and thanks Internet Archive! UPDATE: take some of that back. It goes only to Level 8 then starts over. Disappointing but still fun. Unlimited play helps.